Final answer:
A person who studies rocks is known as a geologist, and they examine various aspects of the Earth's crust to understand our planet's history and structure.
Step-by-step explanation:
The term for someone who studies about rocks is a geologist. Geologists are scientists who explore various aspects of the Earth's crust and the processes that shape the surface of our planet. They utilize various tools and methods, including geochronology, geochemistry, and mineralogy, to study rocks and understand the Earth's history and structure. Rocks, composed of different minerals, provide important clues about geologic events and the environmental conditions of the past. Geologists examine these minerals using instruments like hand lenses or microscopes and employ various techniques to identify them and decipher their history. Notably, rocks from places like the Moon have also shed light on the composition, age, and origin of celestial bodies, hinting that the field of geology extends beyond our planet.